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   &#160;<span id="projectnumber">1.0</span>
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   <div id="projectbrief">Generic and Reusable Parallel Pattern Interface</div>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_0966d06610f72609fd9aa4979c2b5a92.html">common</a></li>  </ul>
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<a href="reduce__pattern_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright 2018 Universidad Carlos III de Madrid</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *     http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * limitations under the License.</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#ifndef GRPPI_COMMON_REDUCE_PATTERN_H</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#define GRPPI_COMMON_REDUCE_PATTERN_H</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrppi.html">grppi</a>{</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Combiner, <span class="keyword">typename</span> Identity&gt;</div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html">   29</a></span>&#160;<span class="keyword">class </span><a class="code" href="classgrppi_1_1reduce__t.html">reduce_t</a> {</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160; </div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#ab2eaf12acd4842c4b4399fd759b462ed">   39</a></span>&#160;  <a class="code" href="classgrppi_1_1reduce__t.html#ab2eaf12acd4842c4b4399fd759b462ed">reduce_t</a>(<span class="keywordtype">int</span> wsize, <span class="keywordtype">int</span> <a class="code" href="classgrppi_1_1reduce__t.html#a6f82cf1a5545bb96bda3fc8cd079279d">offset</a>, Identity <span class="keywordtype">id</span>, Combiner &amp;&amp; combine_op) :</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    window_size_{wsize}, offset_{<a class="code" href="classgrppi_1_1reduce__t.html#a6f82cf1a5545bb96bda3fc8cd079279d">offset</a>}, </div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    identity_{id}, combiner_{combine_op}</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  {}</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; </div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a7319e39544c636e08643bc7f572def58">   50</a></span>&#160;  <span class="keywordtype">void</span> <a class="code" href="classgrppi_1_1reduce__t.html#a7319e39544c636e08643bc7f572def58">add_item</a>(Identity &amp;&amp; item) {</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keywordflow">if</span> (remaining&gt;0) {</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;      remaining--;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    }</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;      items.push_back(std::forward&lt;Identity&gt;(item));</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    }</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;  }</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160; </div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a890baaf65c8b1d05bcbfb02d54bfd74c">   63</a></span>&#160;  <span class="keywordtype">bool</span> <a class="code" href="classgrppi_1_1reduce__t.html#a890baaf65c8b1d05bcbfb02d54bfd74c">reduction_needed</a>()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <span class="keywordflow">return</span> !items.empty() &amp;&amp; (<span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(items.size()) &gt;= window_size_);</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;  }</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160; </div>
<div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a55cbf4126c334c7e8c431be1026c4dab">   71</a></span>&#160;  Combiner <a class="code" href="classgrppi_1_1reduce__t.html#a55cbf4126c334c7e8c431be1026c4dab">combiner</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> combiner_; }</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160; </div>
<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a66f3a25a94d263817120fabb310cec9f">   77</a></span>&#160;  <span class="keywordtype">int</span> <a class="code" href="classgrppi_1_1reduce__t.html#a66f3a25a94d263817120fabb310cec9f">window_size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> window_size_; }</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160; </div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a6f82cf1a5545bb96bda3fc8cd079279d">   83</a></span>&#160;  <span class="keywordtype">int</span> <a class="code" href="classgrppi_1_1reduce__t.html#a6f82cf1a5545bb96bda3fc8cd079279d">offset</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> offset_; }</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160; </div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> E&gt;</div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#a14fd59017bf9aae3e37eabd38c75f849">   90</a></span>&#160;  <span class="keyword">auto</span> <a class="code" href="classgrppi_1_1reduce__t.html#a14fd59017bf9aae3e37eabd38c75f849">reduce_window</a>(<span class="keyword">const</span> E &amp; e) {</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keyword">auto</span> red = e.reduce(items.begin(), items.size(), identity_, combiner_);</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <span class="keywordflow">if</span> (offset_ &gt; window_size_) {</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;      remaining = offset_ - window_size_;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;      items.clear();</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    }</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;      items.erase(items.begin(), std::next(items.begin(), offset_));</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    }</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    <span class="keywordflow">return</span> red;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;  }</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  </div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="classgrppi_1_1reduce__t.html#ae9d3ca10ac55a5ae2a557610cb5f2233">  103</a></span>&#160;  <span class="keyword">auto</span> <a class="code" href="classgrppi_1_1reduce__t.html#ae9d3ca10ac55a5ae2a557610cb5f2233">operator()</a>(T &amp;&amp;){</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keywordflow">return</span> Identity{};</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  }</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160; </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  <span class="keywordtype">int</span> window_size_;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;  <span class="keywordtype">int</span> offset_;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;  Identity identity_;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;  Combiner combiner_;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160; </div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  std::vector&lt;Identity&gt; items{};</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  <span class="keywordtype">int</span> remaining = 0;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;};</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160; </div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160; </div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00120"></a><span class="lineno"><a class="line" href="structgrppi_1_1internal_1_1is__reduce.html">  120</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structgrppi_1_1internal_1_1is__reduce.html">is_reduce</a> : std::false_type {};</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160; </div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C, <span class="keyword">typename</span> I&gt;</div>
<div class="line"><a name="l00123"></a><span class="lineno"><a class="line" href="structgrppi_1_1internal_1_1is__reduce_3_01reduce__t_3_01_c_00_01_i_01_4_01_4.html">  123</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structgrppi_1_1internal_1_1is__reduce.html">is_reduce</a>&lt;<a class="code" href="classgrppi_1_1reduce__t.html">reduce_t</a>&lt;C,I&gt;&gt; :std::true_type {};</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160; </div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;}</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160; </div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="namespacegrppi.html#abce2309ebb836d19490bfed222b35501">  128</a></span>&#160;constexpr <span class="keywordtype">bool</span> <a class="code" href="namespacegrppi.html#abce2309ebb836d19490bfed222b35501">is_reduce</a> = <a class="code" href="structgrppi_1_1internal_1_1is__reduce.html">internal::is_reduce&lt;std::decay_t&lt;T&gt;</a>&gt;();</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160; </div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00131"></a><span class="lineno"><a class="line" href="namespacegrppi.html#a4f2ec5252b5fe6ed39a5a3c501b70732">  131</a></span>&#160;<span class="keyword">using</span> <a class="code" href="namespacegrppi.html#a4f2ec5252b5fe6ed39a5a3c501b70732">requires_reduce</a> = std::enable_if_t&lt;is_reduce&lt;T&gt;,<span class="keywordtype">int</span>&gt;;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160; </div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;} <span class="comment">// end namespace grppi</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160; </div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html"><div class="ttname"><a href="classgrppi_1_1reduce__t.html">grppi::reduce_t</a></div><div class="ttdoc">Representation of reduce pattern. Represents a reduction that can be used as a stage on a pipeline.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:29</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a14fd59017bf9aae3e37eabd38c75f849"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a14fd59017bf9aae3e37eabd38c75f849">grppi::reduce_t::reduce_window</a></div><div class="ttdeci">auto reduce_window(const E &amp;e)</div><div class="ttdoc">Reduce values from a window.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:90</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a55cbf4126c334c7e8c431be1026c4dab"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a55cbf4126c334c7e8c431be1026c4dab">grppi::reduce_t::combiner</a></div><div class="ttdeci">Combiner combiner() const</div><div class="ttdoc">Get the combiner.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:71</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a66f3a25a94d263817120fabb310cec9f"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a66f3a25a94d263817120fabb310cec9f">grppi::reduce_t::window_size</a></div><div class="ttdeci">int window_size() const</div><div class="ttdoc">Get the window size.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:77</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a6f82cf1a5545bb96bda3fc8cd079279d"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a6f82cf1a5545bb96bda3fc8cd079279d">grppi::reduce_t::offset</a></div><div class="ttdeci">int offset() const</div><div class="ttdoc">Get the offset.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:83</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a7319e39544c636e08643bc7f572def58"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a7319e39544c636e08643bc7f572def58">grppi::reduce_t::add_item</a></div><div class="ttdeci">void add_item(Identity &amp;&amp;item)</div><div class="ttdoc">Add an item to the reduction buffer. If there are remaining items before reaching the next window sta...</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:50</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_a890baaf65c8b1d05bcbfb02d54bfd74c"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#a890baaf65c8b1d05bcbfb02d54bfd74c">grppi::reduce_t::reduction_needed</a></div><div class="ttdeci">bool reduction_needed() const</div><div class="ttdoc">Check if a reduction can be performed.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:63</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_ab2eaf12acd4842c4b4399fd759b462ed"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#ab2eaf12acd4842c4b4399fd759b462ed">grppi::reduce_t::reduce_t</a></div><div class="ttdeci">reduce_t(int wsize, int offset, Identity id, Combiner &amp;&amp;combine_op)</div><div class="ttdoc">Construct a reduction pattern object.</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:39</div></div>
<div class="ttc" id="aclassgrppi_1_1reduce__t_html_ae9d3ca10ac55a5ae2a557610cb5f2233"><div class="ttname"><a href="classgrppi_1_1reduce__t.html#ae9d3ca10ac55a5ae2a557610cb5f2233">grppi::reduce_t::operator()</a></div><div class="ttdeci">auto operator()(T &amp;&amp;)</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:103</div></div>
<div class="ttc" id="anamespacegrppi_html"><div class="ttname"><a href="namespacegrppi.html">grppi</a></div><div class="ttdef"><b>Definition:</b> callable_traits.h:21</div></div>
<div class="ttc" id="anamespacegrppi_html_a4f2ec5252b5fe6ed39a5a3c501b70732"><div class="ttname"><a href="namespacegrppi.html#a4f2ec5252b5fe6ed39a5a3c501b70732">grppi::requires_reduce</a></div><div class="ttdeci">std::enable_if_t&lt; is_reduce&lt; T &gt;, int &gt; requires_reduce</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:131</div></div>
<div class="ttc" id="anamespacegrppi_html_abce2309ebb836d19490bfed222b35501"><div class="ttname"><a href="namespacegrppi.html#abce2309ebb836d19490bfed222b35501">grppi::is_reduce</a></div><div class="ttdeci">constexpr bool is_reduce</div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:128</div></div>
<div class="ttc" id="astructgrppi_1_1internal_1_1is__reduce_html"><div class="ttname"><a href="structgrppi_1_1internal_1_1is__reduce.html">grppi::internal::is_reduce</a></div><div class="ttdef"><b>Definition:</b> reduce_pattern.h:120</div></div>
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